Question

Construct the dual graph for the map shown. Then, find the number of colors needed to color the map so that no two adjacent r

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Answer #1

a) The first dual graph will have D connected to A, B and C. C connected to A and B. B connected to A as edges. Hence the dual graph will be using atleast 4 colors

b) In this case, E will be connected to C, F will be connected to D.

B is connected to both D and C

A is connected to B

Hence the number of colors needed will be equal to 2

Note - Post any doubts/queries in comments section.

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